I prefer soldered rail feeder connections, because they are more dependable than the alternatives. A thin tab slipped into the slot in the bottom of a rail may provide an adequate electrical connection at first, but over time it is subject to corrosion and to movement with resulting loss of good contact. On my 2-rail layout I soldered an 18-gauge solid feeder to every individual piece of rail and I have never had a problem with continuity. I made the feeders as short as possible between the rail and the 10-gauge stranded buss, to which they are also soldered. Soldering drop wires/feeders to the rails isn't very difficult if you use a good iron and the correct flux and practice for awhile with an old piece of track, and it is definitely worth the trouble, in my opinion.
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